docs: def attributes(self):
          """Return sync attributes."""
          attr = {
              'name': self.name,
              'id': self.sync_id,
              'network_id': self.network_id,
              'serial': self.serial,
              'status': self.status,
              'region': self.region,
              'region_id': self.region_id,
          }
          return attr